Ensuring coverage of cell-only respondents in survey samples is becoming more important. There are different sampling approaches to accommodate this requirement. In this paper, we compare and contrast the efficiencies and outcomes associated with two of them: (1) passive contact method using a sample of postal service addresses, and (2) active contact method using a sample of cell phone numbers. We evaluated the efficiency of the samples on measures such as response rates and cost per interview. We contrasted the characteristics of respondents reached via each of the sample types based on telephone ownership patterns: landline only, cell only, and both landline / cell. Sizes of both samples were quite large and provided significant methodological insights.